Which of the following is the correct solution to 7-2-9-8 - Solve by estimation-

First we round 7.2 to the nearest unit As 0.2 lt;0.5 so, 7.2≈7 Now, we round 9.8 to the nearest unit As 0.8 gt;0.5 so, 9.8≈10 ⇒ 7.2×9.8 = 7×10 = 70 Check ...

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Standard VI

Mathematics

Estimating sums involving Product and Division of Decimal Numbers

Which of the ...

Question

Which of the following is the correct solution to $7.2 \times 9.8$ ? Solve by estimation.

52.16

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98.36

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70.56

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75.43

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Solution

The correct option is C $70.56$
First we round $7.2$ to the nearest unit
As $0.2 < 0.5$ so, $7.2 \approx 7$

Now, we round $9.8$ to the nearest unit
As $0.8 > 0.5$ so, $9.8 \approx 10$

$\Rightarrow$ $7.2 \times 9.8 = 7 \times 10 = 70$

Checking the options, $70$ is nearest to $70.56$ compared to $98.36$ , $75.43$ and $52.16$ , so it is the right answer.

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Which of the following is the correct solution to 7.2×9.8 ? Solve by estimation.

The correct option is C 70.56First we round 7.2 to the nearest unit As 0.2<0.5 so, 7.2≈7 Now, we round 9.8 to the nearest unit As 0.8>0.5 so, 9.8≈10 ⇒ 7.2×9.8=7×10=70 Checking the options, 70 is nearest to 70.56 compared to 98.36, 75.43 and 52.16, so it is the right answer.

Which of the following is the correct solution to $7.2 \times 9.8$ ? Solve by estimation.